The problem is that even with GCC 13, configure does not generate a definition of macro NEW_GLIBC. This makes the package use old names of the stat functions it wants to use and since those are not declared, the compilation fails with GCC 14. Compiling with option -DNEW_GLIBC - simulating correct config result, avoids the problem but seems a rather terrible hack. Someone needs to properly regenerate the autotools bits in the package. Meanwhile, I have created https://build.opensuse.org/request/show/1194739 to work-around the issue by compiling with -Wno-error=implicit-function-declaration.